[PATCH] xen: build fix with gcc 4.5

[Christoph Egger <Christoph.Egger@amd.com>]

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Fix build failure with gcc 4.5 on NetBSD:
implicit declaration of __builtin_stdarg_start

Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>
From: David Brownlee <abs@netbsd.org>

Please also apply this to xen-4.1-testing.

-- 
---to satisfy European Law for business letters:
Advanced Micro Devices GmbH
Einsteinring 24, 85689 Dornach b. Muenchen
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Registergericht Muenchen, HRB Nr. 43632

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diff -r 9a84303b600c xen/include/xen/stdarg.h
--- a/xen/include/xen/stdarg.h	Thu Jan 05 14:46:28 2012 +0100
+++ b/xen/include/xen/stdarg.h	Thu Jan 05 16:15:47 2012 +0100
@@ -5,7 +5,17 @@
 #  include "/usr/include/stdarg.h"
 #elif defined (__NetBSD__)
    typedef __builtin_va_list va_list;
-#  define va_start(ap, last)    __builtin_stdarg_start((ap), (last))
+#  ifdef __GNUC__
+#    define __GNUC_PREREQ__(x, y)                                       \
+        ((__GNUC__ == (x) && __GNUC_MINOR__ >= (y)) ||                  \
+         (__GNUC__ > (x)))
+#  else
+#    define __GNUC_PREREQ__(x, y)   0
+#  endif
+#  if !__GNUC_PREREQ__(4, 5)
+#    define __builtin_va_start(ap, last)    __builtin_stdarg_start((ap), (last))
+#  endif
+#  define va_start(ap, last)    __builtin_va_start((ap), (last))
 #  define va_end(ap)            __builtin_va_end(ap)
 #  define va_arg                __builtin_va_arg
 #else

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